Bridge calculator



FIG. 1 is a perspective view of a bridge calculator having a shape in accordance with my new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a rear elevational view thereof;

FIG. 4 is a top plan view thereof;

FIG. 5 is right side elevational view thereof; and,

FIG. 6 is a bottom plan view thereof.

The structure depicted by means of broken lines is for illustrative purposes only and forms no part of the claimed design. 

The ornamental design for a bridge calculator, as shown and described. 